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A pilot on a space ship moving at 0.86c away from the Earth sends a laser beam signal to Earth. (a) The pilot measures the speed v of the laser beam signal to be (A) v (C) v > c. (b) The people on Earth measure the speed y of the laser to be (A) v (C) v > c.

A pilot on a space ship moving at 0.86c away from the Earth sends a laser beam signal to Earth.
(a) The pilot measures the speed v of the laser beam signal to be
(A) v
(C) v > c.                                                                            
(b) The people on Earth measure the speed y of the laser to be
(A) v
(C) v > c.            

Grade:upto college level

1 Answers

Navjyot Kalra
askIITians Faculty 654 Points
8 years ago
(a)
The correct option is (B) v = c.
A pilot on a space ship moving at 0.86c away from the Earth sends a laser beam signal to Earth. Light wave is an electromagnetic wave. Its value will be same irrespective of the frame reference. Therefore the pilot measures the speed v of the laser beam signal to be equal to the speed of light c. From the above observation we conclude that, option (B) is correct.
(b)
The correct option is (B) v = c.
A pilot on a space ship moving at 0.86c away from the Earth sends a laser beam signal to Earth. Light wave is an electromagnetic wave. Its value will be same irrespective of the frame reference. Therefore, the people on Earth measure the speed v of the laser beam signal to be equal to the speed of light c. From the above observation we conclude that, option (B) is correct.

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